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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8373ad4ce66145cf99dcbd8a677d926ad52a14761c00049f119bb316c091ba79' 
  AND token = '8sfS9QNGXRd7h0Mrs2SF2JPIVwhk7Eljc1rnNraMfRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}